119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
#pragma once
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#include <vector>
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#include <memory>
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#include <string>
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#include <pdfengine/graphics_state.hpp>
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#include <pdfengine/path.hpp>
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#include <pdfengine/image.hpp>
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namespace pdfengine {
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class CommandVisitor;
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// Base class for all drawing commands
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struct Command {
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virtual ~Command() = default;
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virtual void accept(CommandVisitor& visitor) const = 0;
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};
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// --- Specific Command Types ---
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struct SaveStateCommand : public Command {
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void accept(CommandVisitor& visitor) const override;
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};
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struct RestoreStateCommand : public Command {
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void accept(CommandVisitor& visitor) const override;
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};
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struct SetTransformCommand : public Command {
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Matrix matrix;
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explicit SetTransformCommand(const Matrix& m) : matrix(m) {}
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void accept(CommandVisitor& visitor) const override;
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};
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struct FillRectCommand : public Command {
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float x, y, width, height;
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FillRectCommand(float x, float y, float w, float h) : x(x), y(y), width(w), height(h) {}
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void accept(CommandVisitor& visitor) const override;
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};
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struct DrawTextCommand : public Command {
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std::string text;
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float x, y;
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// We would eventually have a font reference here too
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DrawTextCommand(std::string text, float x, float y) : text(std::move(text)), x(x), y(y) {}
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void accept(CommandVisitor& visitor) const override;
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};
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struct FillPathCommand : public Command {
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Path path;
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explicit FillPathCommand(Path path) : path(std::move(path)) {}
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void accept(CommandVisitor& visitor) const override;
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};
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struct StrokePathCommand : public Command {
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Path path;
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explicit StrokePathCommand(Path path) : path(std::move(path)) {}
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void accept(CommandVisitor& visitor) const override;
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};
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struct DrawImageCommand : public Command {
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ImageInfo image;
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Matrix matrix;
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float opacity;
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DrawImageCommand(ImageInfo img, Matrix m, float op = 1.0f)
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: image(std::move(img)), matrix(m), opacity(op) {}
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void accept(CommandVisitor& visitor) const override;
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};
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// --- Visitor Interface ---
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// The visitor interface that the renderer (or replay engine) implements
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class CommandVisitor {
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public:
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virtual ~CommandVisitor() = default;
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virtual void visit(const SaveStateCommand& cmd) = 0;
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virtual void visit(const RestoreStateCommand& cmd) = 0;
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virtual void visit(const SetTransformCommand& cmd) = 0;
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virtual void visit(const FillRectCommand& cmd) = 0;
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virtual void visit(const DrawTextCommand& cmd) = 0;
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virtual void visit(const FillPathCommand& cmd) = 0;
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virtual void visit(const StrokePathCommand& cmd) = 0;
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virtual void visit(const DrawImageCommand& cmd) = 0;
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};
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// --- Display List Container ---
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// A container that stores a sequence of drawing commands.
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class DisplayList {
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public:
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DisplayList() = default;
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// Add commands directly
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void addCommand(std::unique_ptr<Command> cmd);
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// Replay the commands to a visitor (renderer)
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void replay(CommandVisitor& visitor) const;
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// Helper methods to easily append common commands
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void saveState();
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void restoreState();
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void setTransform(const Matrix& m);
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void fillRect(float x, float y, float w, float h);
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void drawText(const std::string& text, float x, float y);
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void fillPath(const Path& path);
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void strokePath(const Path& path);
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void drawImage(const ImageInfo& image, const Matrix& m, float opacity = 1.0f);
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[[nodiscard]] size_t size() const noexcept { return m_commands.size(); }
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void clear() { m_commands.clear(); }
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private:
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std::vector<std::unique_ptr<Command>> m_commands;
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};
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} // namespace pdfengine
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